The Java.util.Stack.isEmpty() method in Java is used to check and verify if a Stack is empty or not. It returns True if the Stack is empty else it returns False.
Syntax:
Stack.isEmpty()
Parameters: This method does not take any parameter.
Return Value: This function returns True if the Stackis empty else it returns False.
Below programs illustrate the Java.util.Stack.isEmpty() method:
Program 1:
// Java code to illustrate isEmpty()import java.util.*;  public class StackDemo {    public static void main(String args[])    {        // Creating an empty Stack        Stack<String> stack = new Stack<String>();          // Use add() method to add elements into the Stack        stack.add("Welcome");        stack.add("To");        stack.add("Geeks");        stack.add("4");        stack.add("Geeks");          // Displaying the Stack        System.out.println("Stack: " + stack);          // Verifying if the Stack is empty or not        System.out.println("Is the Stack empty? "                           + stack.isEmpty());          // Clearing the Stack        stack.clear();          // Displaying the Stack        System.out.println("Stack after clear(): "                           + stack);          // Verifying if the Stack is empty or not        System.out.println("Is the Stack empty? "                           + stack.isEmpty());    }} |
Output:
Stack: [Welcome, To, Geeks, 4, Geeks] Is the Stack empty? false Stack after clear(): [] Is the Stack empty? true
Program 2:
// Java code to illustrate isEmpty()import java.util.*;  public class StackDemo {    public static void main(String args[])    {        // Creating an empty Stack        Stack<Integer> stack = new Stack<Integer>();          // Displaying the Stack        System.out.println("Stack: " + stack);          // Verifying if the Stack is empty or not        System.out.println("Is the Stack empty? "                           + stack.isEmpty());    }} |
Output:
Stack: [] Is the Stack empty? true
